Added support for PHP 8.4.

Author: Bilge

.github/workflows/Tests.yaml

@@ -15,6 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         php:
+          - 8.4
+          - 8.3
           - 8.2
           - 8.1
           - 8.0
@@ -23,7 +25,7 @@ jobs:
           - lo
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Setup PHP ${{ matrix.php }}
         uses: shivammathur/setup-php@v2
@@ -36,7 +38,7 @@ jobs:
 
       - name: Cache dependencies
         id: composer-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: vendor
           key: php-${{ matrix.php }}-${{ matrix.dependencies }}-${{ hashFiles('composer.json') }}

src/retry.php

@@ -17,7 +17,7 @@
  * @throws FailingTooHardException The maximum number of attempts was reached.
  * @throws \UnexpectedValueException The operation returned an unsupported type.
  */
-function retry(int $tries, callable $operation, callable $onError = null): mixed
+function retry(int $tries, callable $operation, ?callable $onError = null): mixed
 {
     // Nothing to do if tries less than or equal to zero.
     if ($tries <= $attempts = 0) {